Normally in an app you want to better use the tablet screen not to take up 
more room. I'm assuming this is for a game where the situation is a bit 
different sometimes. 
See the cn1pocker demo. It includes this:

            
UIManager.getInstance().setThemeProps(theme.getTheme(theme.getThemeResourceNames()[0]));
            cards = Resources.open("/gamedata.res", calculateDPI());

Notice we give the target DPI explicitly which lets you determine the DPI 
you want on the given device.

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